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| 屋顶导流结构对城市街谷内污染物扩散的影响 |
| Influence of roof wind-catcher structures on pollutant dispersion within urban street canyons |
| 投稿时间：2024-01-16 |
| DOI：10.13259/j.cnki.eri.2025.04.001 |
| 中文关键词: 屋顶形状 导流结构 街道峡谷 污染物扩散 数值模拟 |
| 英文关键词:roof shape wind catcher street canyon pollutant dispersion numerical simulation |
| 基金项目:国家自然科学基金资助（42277477、52106102） |
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| 中文摘要: |
| 为研究不同屋顶形状的导流结构对城市街谷内气流流动和污染物扩散规律的影响。考察了5种屋顶结构的街谷和4种导流结构（捕风器），利用经风洞实验验证的计算流体力学（CFD）数值模型对街谷内流动与污染物扩散规律进行了模拟。结果表明，设置导流结构能大幅增强街谷（双平屋顶、双三角形屋顶、双上楔形屋顶）的平均通风能力，但对双下楔形屋顶街谷的通风能力影响不大。不同导流结构的设置方式对双梯形屋顶街谷内污染物扩散影响不同。通过增大导流结构的角度、平行间距以及长度，或者减小导流结构的宽度，均可显著提高街谷的通风能力。研究表明导流结构可精准调控街谷内局部空气质量。 |
| 英文摘要: |
| To explore the influence of different roof shapes with wind catchers on airflow and pollutant dispersion in street canyons, five canyon configurations with distinct roof structures and four types of wind-catcher deflectors were examined. A computational fluid dynamics (CFD) model, validated through wind-tunnel experiments, was used to simulate flow patterns and pollutant transport inside the canyons. The results show that the installation of wind-catchers significantly enhances the average ventilation capacity in canyons with double-flat, double-triangular, and double-up-wedge roofs, while its effect remains limited in canyons with double-down-wedge roofs. The various wind catchers, however, exert distinct influences on street canyon with double-trapezoidal roofs. Increasing the angle, parallel spacing, or length, as well as reducing the width of wind catchers, the ventilation capacity and pollutant dilution in street canyons can be improved significantly, thereby the local air quality can be accurately regulated. |
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